From c94dc34f771a25b8c3e0955147fdc4f5e3d79908 Mon Sep 17 00:00:00 2001 From: Eugene Korenevsky Date: Sun, 25 Jun 2017 11:08:14 +0300 Subject: [PATCH] USB hub_probe: rework ugly goto-into-compound-statement Rework smelling code (goto inside compound statement). Perhaps this is legacy. Anyway such code is not appropriate for Linux kernel. Signed-off-by: Eugene Korenevsky Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 38 +++++++++++++++++++++----------------- 1 file changed, 21 insertions(+), 17 deletions(-) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 59e0418a5ed5..6e6797d145dd 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1661,10 +1661,28 @@ static void hub_disconnect(struct usb_interface *intf) kref_put(&hub->kref, hub_release); } +static bool hub_descriptor_is_sane(struct usb_host_interface *desc) +{ + /* Some hubs have a subclass of 1, which AFAICT according to the */ + /* specs is not defined, but it works */ + if (desc->desc.bInterfaceSubClass != 0 && + desc->desc.bInterfaceSubClass != 1) + return false; + + /* Multiple endpoints? What kind of mutant ninja-hub is this? */ + if (desc->desc.bNumEndpoints != 1) + return false; + + /* If the first endpoint is not interrupt IN, we'd better punt! */ + if (!usb_endpoint_is_int_in(&desc->endpoint[0].desc)) + return false; + + return true; +} + static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) { struct usb_host_interface *desc; - struct usb_endpoint_descriptor *endpoint; struct usb_device *hdev; struct usb_hub *hub; @@ -1739,25 +1757,11 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) } #endif - /* Some hubs have a subclass of 1, which AFAICT according to the */ - /* specs is not defined, but it works */ - if ((desc->desc.bInterfaceSubClass != 0) && - (desc->desc.bInterfaceSubClass != 1)) { -descriptor_error: + if (!hub_descriptor_is_sane(desc)) { dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); return -EIO; } - /* Multiple endpoints? What kind of mutant ninja-hub is this? */ - if (desc->desc.bNumEndpoints != 1) - goto descriptor_error; - - endpoint = &desc->endpoint[0].desc; - - /* If it's not an interrupt in endpoint, we'd better punt! */ - if (!usb_endpoint_is_int_in(endpoint)) - goto descriptor_error; - /* We found a hub */ dev_info(&intf->dev, "USB hub found\n"); @@ -1784,7 +1788,7 @@ descriptor_error: if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) hub->quirk_check_port_auto_suspend = 1; - if (hub_configure(hub, endpoint) >= 0) + if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) return 0; hub_disconnect(intf); -- 2.20.1